<body><p>
Tests that <code>window.open()</code> does not interpret the missing URL
argument as the literal string &ldquo;undefined&rdquo;.
</p><p>
Click the Test button. A new window should open. To pass the test, the address
bar of the new window should be empty. If it contains a URL (ending with &ldquo;undefined&rdquo;), WebKit failed the test.
</p><button onclick="window.open()">Test</button></body>